From the java sources, it look like to drops into native code. Is the cost roughly equivalent to a volatile read or does it need to acquire a lock of some type?
I am writing a networking application using the java.nio api. My plan is to perform I/O on one thread, and handle events on another. To do this though, I need to synchronize reading/writing so that a race condition is never met.
Bearing in mind that I need to handle thousands of connections concurrently, is synchronization worth it, or should I use a single thread for I/O and event handling?
hi guys , i want to design a small website like stackoverflow (but in deferent language) and i want to use an opensource secure scalable cms to do that , so what cms to use ? ( i prefer using java )
thanks .
I am looking for :-
A mature, scalable and proven CMS solution
With Support for Mobilization (Android and iPhone)
Good Amount of Customization using Java / .NET
Lots of out of the box components to choose from.
Please help with recommendations.
p.s Are there any Mobile CMS providers which works in a SaaS model?
I am interacting with a third party application using it's API, and would like to move it to the front of focus (so that it is on top of all other open windows) when a user performs a certain action. While I can move my application up and down in the hierarchy pretty easily, there doesn't appear to be a way to interact with other windows. Is it possible to move another program's window to front with Java?
I want to compare to variables, both of type T extends Number. Now I want to know which of the two variables is greater than the other or equal. Unfortunately I don't know the exact type yet, I only know that it will be a subtype of java.lang.Number.
How can I do that?
Thanks!
According to the Release Notes:
All user request have an
X-AppEngine-Country header which
contains the ISO-3166-1 alpha-2
country code for the user, based on
the IP address of the client request.
My app is running on localhost with the 1.5.1 Java release which contains the X-AppEngine-Country header but I don't seem to be receiving any value for this header in my requests.
Do I have to deploy the app to a production instance to test this feature?
Hi!
i would like to avoid texts like this one: height="49" with a regular expresion.
I tought in .replaceAll("\s*="*"","");
(replaceAll is used as a method in a java class), but eclipse don't allowed me to do that.
Any other suggestion??
tx!
Hi - I need to write some junit tests on java code that calls Math.random(). I know that I can set the seed if I was instantiating my own Random object to produce repeatable results. Is there a way to do this also for Math.random() ?
I have a for loop and structure like this :
for(....)
....
....
if(isTrue)
... do something..
.. method to be executed once (doTrick) is declared outside for loop.
....endif
endfor
public void doTrick()
...
...
..end
Is it possible for a method in for loop to be executed only once? I'm using JAVA
Most often the cleanup rules (Preferences Java Code Style Clean Up) in Eclipse work perfectly and create nice-looking code.
But sometimes, especially with comments and concatenated string snippets (like inline SQL queries), the cleanup just messes things up, and destroys my formatting.
Is there a way to say to Eclipse "Don't touch this block of text! I have formatted it just the way I like, and you would make it just less readable"?
As we know to generate a class file there should be atleast one class or interface or an Enum should be declared in the java file.
So i was curious that is there anything else as well other the mentioned which can cause a class file generation.
Or did anybody think that as we can declare the above mentioned, we can declare this(Which you think) as well ?
hi, i have to connect java to mysql db using jdbc. thats not a problem and i can query data from db successfully. the problem is, i have another class that i need to execute which the application is using the data from db. can i execute jdbc and call the application class to executed after the data dragged from db?means, i just execute jdbc class in command prompt and automatically application class also executed
https://twitter.com/sessions?authenticity_token=b1b43178e09c1e6ccec1b3183f1f139f39643aaf&session%5Busername_or_email%5D=ddddd&session%5Bpassword%5D=rrrrr&q=&site_action=https%3A%2F%2Ftwitter.com%2Fsessions&serialized_string=Hello
why is this url throwing a java.net.MalformedURLException??
I have a Java code defined as:
String[] where;
/**/where.append(ContactsContract.Contacts.HAS_PHONE_NUMBER+"=1");
/**/where.append(ContactsContract.Contacts.IN_VISIBLE_GROUP+"=1");
Those two appends are not working in this form, how would that work correctly?
I need a shallow copy of an java ArrayList, should I use clone() or iterate over original list and copy elements in to new arrayList, which is faster ?
I'm having a session object that does NOT implement the java.lang.Serializable. (its a legacy application, and now I can't go and change the code)
Is there any way where I can store the session object some where and later GET BACK THE SAME STATE in a STANDALONE application.
One thought is to use RMI. Is there any better way of achieving this.
Thank you :)
Hi
This was the question asked in interview.Can anybody help me out it in implementing in java
Given 2 linked lists(which need not have unique elements) find intersection point in the form of Y.(it can be anywhere--middle or tail)
Hi, I am just learning Java and am trying to get my program to retrieve the first digit of a number - for example 543 should return 5, etc. I thought to convert to a string, but I am not sure how I can convert it back? Thanks for any help.
int number = 534;
String numberString = Integer.toString(number);
char firstLetterChar = numberString.charAt(0);
int firstDigit = ????
Hello,
I have written a webservice which is taking URL as an input and producing a JSON respone. My problem is that now I have list of 1000 URLs and want to execute maximum threads of Webapplications to get output. Like I want to execute 100 instances of webservice at a time to get response.Please can anybody give some guidance how can I do it using java.
Thank you in advance
I have an application which uses UDP connection, now when i try to run the app more than once its throwing me an exception
java.net.BindException: Address already in use: Cannot bind
but in my another app, which uses tcp connection, i can open two instance of the same app and its working fine. why this error only with UDP connection?
I've tried before some Eclipse plugin (I don't remember its name) but it was lacking a lot of features (generics, for example). Is there anything easy to set up that would run on the last version of Java?
Thanks